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Question

Find the surface area of a cone.
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A
8635 m2
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B
86.35 m2
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C
0.8635 m
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D
8.635 m2
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Solution

The correct option is D $$\displaystyle 8.635{ \ m }^{ 2 }$$
Surface area of a cone $$\displaystyle =\pi rs+\pi { r }^{ 2 }$$

$$\displaystyle =3.14\times \frac { 1 }{ 2 } \times 5+3.14\times \frac { 1 }{ 2 } \times \frac { 1 }{ 2 } $$

$$\displaystyle =7.85+0.785$$

$$\displaystyle = 8.635{ m }^{ 2 }$$

So, option D is correct.

Mathematics

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